libwebp: update to 0.4.2-rc2

third_party/libwebp/demux/demux.c

 // Copyright 2012 Google Inc. All Rights Reserved.
 //
 // Use of this source code is governed by a BSD-style license
 // that can be found in the COPYING file in the root of the source
 // tree. An additional intellectual property rights grant can be found
 // in the file PATENTS. All contributing project authors may
 // be found in the AUTHORS file in the root of the source tree.
 // -----------------------------------------------------------------------------
 //
 //  WebP container demux.
 //
 
 #ifdef HAVE_CONFIG_H
 #include "../webp/config.h"
 #endif
 
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include "../utils/utils.h"
 #include "../webp/decode.h"     // WebPGetFeatures
 #include "../webp/demux.h"
 #include "../webp/format_constants.h"
 
 #define DMUX_MAJ_VERSION 0
 #define DMUX_MIN_VERSION 2
-#define DMUX_REV_VERSION 1
+#define DMUX_REV_VERSION 2
 
 typedef struct {
   size_t start_;        // start location of the data
   size_t end_;          // end location
   size_t riff_end_;     // riff chunk end location, can be > end_.
   size_t buf_size_;     // size of the buffer
   const uint8_t* buf_;
 } MemBuffer;
 
 typedef struct {
@@ skipping 954 matching lines @@
         (const char*)iter->chunk.bytes - CHUNK_HEADER_SIZE;
     return SetChunk(fourcc, iter->chunk_num - 1, iter);
   }
   return 0;
 }
 
 void WebPDemuxReleaseChunkIterator(WebPChunkIterator* iter) {
   (void)iter;
 }